/*******************************************************************************
 * Copyright 2011 Alexandre Zglav and Morphiastic
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package com.morphiastic.analysis.filters;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;

import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentBuilder;

import com.morphiastic.analysis.AnalysisComponentDefinition;
import com.morphiastic.utils.EqualsUtil;


public class ElisionTokenFilter extends ElasticFilter{

	
	public static final String ARTICLE_SEPARATOR = ",";
	public static final String ARTICLES_PARAM_KEY = "articles";
	
	
	private Set<String> articles;
	
	
	
	public ElisionTokenFilter(String defName){
		this(null,defName);
	}
	
	
	public ElisionTokenFilter(Map<String,String> params, String defName){
		
		super(ElasticFilterType.elision, defName);
		
		if(params!=null){
			String stopwStr = params.get(ARTICLES_PARAM_KEY);
			if(stopwStr!=null && !stopwStr.isEmpty()){
				this.articles=new HashSet<String>();
				String[] stopwds = stopwStr.split(ARTICLE_SEPARATOR);
				for (String stopw : stopwds) {
					this.articles.add(stopw.trim());
				}
			}
		}
	}
	
	
	
	
	
	@Override
	public boolean hasCustomParams() {
		 if(this.articles!= null )return true;
		 return false;
	}
	
	
	
	@Override
	public XContentBuilder addToBuilder(XContentBuilder mappingBuilder) throws IOException {
		mappingBuilder.startObject(getDefinitionName())
		.field("type", getComponentSubTypeName());
		
		//add custom params
		if(this.articles!=null){
			List<String> stopWrdsList = new ArrayList<String>(this.articles);
			mappingBuilder.field(ARTICLES_PARAM_KEY, stopWrdsList);
		}
		return mappingBuilder;
	}
	
	
	
	@Override
	public void setParamsFromSettings(Settings settings) {
		Settings stopWordsSettings = settings.getByPrefix(ARTICLES_PARAM_KEY+".");
		if (stopWordsSettings.getAsMap().size()>0)this.articles = new HashSet<String>();
		for (Entry<String, String> stopWordSetting : stopWordsSettings.getAsMap().entrySet()) {
			this.articles.add(stopWordSetting.getValue());
		}
	}
	

	@Override
	public boolean areEquivalentDefinitions(AnalysisComponentDefinition other){
		
		if(other==null)return false;
		ElisionTokenFilter o;
		try {
			o = (ElisionTokenFilter)other;
		} catch (ClassCastException e) {
			return false;
		}
		return 
		EqualsUtil.areEqual(this.articles, o.articles);
	}
	
	
}
